front heater works part time

sometimes it works normal until I turn car off but sometimes it coms back on like normal but most of the time it wont come on unless I hit a railroad tracks,potholle,manholecover before it will come on is it the fan going out or worse the heater unit the rear heater and fan work just fine

2 Answers

I am a bit confused about the front heater & rear heater. I have done no
research on this particular vehicle. For all I know they have designed
something like a space heater for passengers in the back that operates
independently relying only on the electricity it's provided.
If your heater is not working most of the time & does when the vehicle
hits a pot hole, the heater core would be my first guess. You can flush
out your antifreeze with a bunch of different product options. The heater
core is difficult to replace because it is most likely located behind the fire
wall or between your car stereo & the engine just behind the glove box.
I flushed mine by locating where the h20 hose went into & out of that
area. I disconnected both sides & hooked my yard hose up to it. With
the help of a friend I began turning it on slowly to see if any water came
out-- it did although it was a very rusty brown. I flushed it until the water
was clear and replaced the fluids with new antifreeze; after that my
heater worked. I am not a mechanic so I apologize for my laymen, or
lame, guess.

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